Study of the excited charm and charm–strange mesons

Qiang Li; Yue Jiang; Tianhong Wang; Han Yuan; Guo-Li Wang; Chao-Hsi Chang

doi:10.1140/epjc/s10052-017-4865-y

EPJ

Study of the excited $$1^-$$

charm and charm–strange mesons

Qiang Li¹, Yue Jiang¹, Tianhong Wang¹, Han Yuan¹, Guo-Li Wang¹^* and Chao-Hsi Chang²^,3

¹ Harbin Institute of Technology, Harbin, 150001, People’s Republic of China
² CCAST (World Laboratory), P.O. Box 8730, Beijing, 100080, People’s Republic of China
³ Institute of Theoretical Physics, Chinese Academy of Sciences, P.O. Box 2735, Beijing, 100080, People’s Republic of China

Received: 9 February 2017
Accepted: 26 April 2017
Published online: 9 May 2017

Abstract

We give a systematical study on the recently reported excited charm and charm–strange mesons with potential $$1^-$$

spin–parity, including the $D^*_{s1}(2700)^+$ , $D^*_{s1}(2860)^+$ , $$D^*(2600)^0$$

and

. The main strong decay properties are obtained in the framework of Bethe–Salpeter (BS) methods. Our results reveal that the two $$1^-$$

charm–strange mesons can be well described by the further $2^3\!S_1$ – $1^3\!D_1$ mixing scheme with a mixing angle of $(8.7^{+3.9}_{-3.2})^\circ$ . The predicted decay ratio $\frac{\mathcal {B}(D^*K)}{\mathcal {B}(D~K)}$ for $D^*_{s1}(2860)$ is $0.62^{+0.22}_{-0.12}$ . $$D^*(2600)^0$$

can also be explained as the $2^3\!S_1$ predominant state with a mixing angle of $-(7.5^{+4.0}_{-3.3})^\circ$ . Considering the mass range, $$D^*(2650)^0$$

and

are more likely to be the $2^3\!S_1$ predominant states, although the total widths under the two $2^3\!S_1$ and $1^3\!D_1$ assignments have no great conflict with the current experimental data. The calculated width for the LHCb $$D^*_1(2760)^0$$

seems to be about 100 MeV larger than the experimental measurement if taking it as $1^3\!D_1$ or $1^3\!D_1$ dominant state $c\bar{u}$ . The comparisons with other calculations and several important decay ratios are also presented. For the identification of these $$1^-$$

charm mesons, further experimental information, such as $\frac{\mathcal {B}(D\pi )}{\mathcal {B}(D^*\pi )}$ , is necessary.

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EPJ

Study of the excited charm and charm–strange mesons

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